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Finding the Fourth Proportional to 13,810.30, 20,715.45 and 13,008.40

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Solution

The fourth proportional to 13,810.30, 20,715.45 and 13,008.40 is: 19,512.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,810.30 : 20,715.45 = 13,008.40 : x
  2. Step 2: Convert to fraction form
    13,810.30/20,715.45 = 13,008.40/x
  3. Step 3: Cross multiply
    13,810.30x = 20,715.45 × 13,008.40
  4. Step 4: Simplify right side
    13,810.30x = 269,474,859.78
  5. Step 5: Solve for x
    x = 269,474,859.78/13,810.30
  6. Step 6: Final answer
    x = 19,512.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.